[LU-19741] e2fsck -D fails to rebuild a large dir reporting directory corruption

• Type: Bug
• Resolution: Unresolved
• Priority: Medium
• Severity: 3
• Assignee: Alexander Zarochentsev
• Reporter: Alexander Zarochentsev

Description

md66.raw is an mdt fs image, with large dir support feature and a really large dir (~25GB) with inode num 871679245. An attempt to optimise the dir fails :

[c17826@s-lmo-kalina e2fsprogs]$ e2fsck/e2fsck -fvD ../md66.raw
e2fsck 1.47.3-wc2 (11-Nov-2025)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 3A: Optimizing directories
Failed to optimize directory /REMOTE_PARENT_DIR/0x2404dc0f8:0x5290:0x0/[0x2404dd096:0x1cfa:0x0]:0/fill_inodes_202505020614/[0x2404de257:0x3e38:0x0]:0/20/[0x2404de257:0x3e39:0x0]:0/#test-dir.0/[0x2404de257:0x3e3a:0x0]:0/mdtest_tree.0.0/[0x2404de257:0x3e3b:0x0]:0 (871679245): EXT2 directory corrupted
Pass 4: Checking reference counts
Pass 5: Checking group summary information

kjcf05-MDT0001: ***** FILE SYSTEM WAS MODIFIED *****

   396331740 inodes used (9.23%, out of 4294122984)
         173 non-contiguous files (0.0%)
        1414 non-contiguous directories (0.0%)
             # of inodes with ind/dind/tind blocks: 0/0/0
             Extent depth histogram: 396330066/1652/16
  1110956081 blocks used (21.66%, out of 5129394512)
           0 bad blocks
           5 large files

   392518277 regular files
     3665320 directories
           0 character device files
           0 block device files
           0 fifos
       97003 links
      148133 symbolic links (0 fast symbolic links)
           0 sockets
------------
   396427686 files

an fs check w/o -D doesn't show any sign of directory corruption.